Adjustable inclined davit



A. P. SCHAT.

4ADJUSTABLE INCLINED DAVIT. APPLICATION FILED MAR. 29. 1919.

1,369,132. Patented Feb. 22,1921.

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paire sra Ann r'. serrer,- or SAN FRANCISCO, CALIFORNIA,

nnJ-UsTABLEiNoLiNr-in DAvrr. l Y

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lie it known that l, ANB P. SCHAT, a citicen of the Nfetherlands@residing Vat San Francisco, in the county of'SanFrancisco and State ofCalifornia, have invented certain new and useful improvements linAdjustable inclined Davits, of which the'following is a specification..i

lily invention relates Vto hoisting and lowering' devices, and isspecially adapted for use as a-davit for ships.

Some of the leading features ,of theinvention are closely related tothose set forth 1n my pending' application #230,l06 and $959,790, oneobject being` to provide `a rotatable davit which, when releasedfromfits; normal position w ll swingA outwardly by,

lgravity, thus insuring thatthe'lifeboats will be automatically .broughtinto position to be lowered into the water without theapplication ofmechanical force. i

Another very' important object .is :to proride brake mechanism forcontrolling'the davit to prevent too free a rotation thereof, and forlocking'V it in any given position when desired. y

'fr further object is `to' provide means for supportingthe davit in thesame plane at ferent planes, whereby to regulate the power` mine lthedirection of its movements.

Still another object is to provide a davit. :adapted to kbe controlledand operated froml at which the weight is supported as 'close to thewater as possible. Y

Further objects will appear joined description. in considering' theooeration of the desliouldof course be bornein mind that each'boat issupplied, as is usual, with which in vthe subtwo ilavits (one at eachend thereof) rotate toward each other.

in important feature of the construction shown in the drawings consistsof a ldavit mounted at its" lower end in a socket on the' gree ofinclination, and for -causing'theA inferent angles of inclination,`andin dif-v:

i its automatic movement, and to predeterspecification of Lettersratent.Patent-ed FebI 22, 1921 application mediteren 29, 1919.' serial no.286,018. j

Figure 1 is a side elevation of one ofmy GFF-ice improved Ydavit`s,fwithcertainv parts shown in section, the normal" position of the'davit bemp;shown in fulllines, and its innermost and outermost positions in dottedllines. l' i `Fig. 2 is a fragmentary top plan View, on

an enlarged scale,'show1ng' one form (of.

brake Amechanism which I employ vfor C011-,

trolling 'thev rotation of the davit, thebrake wh'eeland davit beingshownin sectiort 3 is a top plan view of the adjustable guide mechanismemployed,l with my ldavit to predetermine the direction of its outboardmovement, relatively tothe longitudinalel tent of theship, andeto guidethe davit in said movement.. 'Y

Fig'. 4 is an inverted plan view showing the outer end of the`ruideplate,disconnected from the parts-with whichit coperates; Y

and,

on which the guide plate rotates.

' Referring further .to the drawings, Y the-- numeral l indicates theupper deck of-a ship,

ment Von its support 3.

p On the upper ,deck l of, the Aship the4 guide plate' 6,-hav'ing itsouter end portion` 6a projecting over the side of tl`1eship,.andv

this projecting portion isprovided with a longitudinal slot 7 throughwhich they davit passes. When ythedavit yis standing in a e verticalpositionV on yits support', 1t

passes through the slot ati the point indicated by 5* in Fig'. 3,' andthe guide plate 6 is' so constructed that itrotates around this point 5Xas a center; from which it will be seen thatvby'a suitable rotation ofsaid guide plate, the davit may be made to :swing out-` board'at anydesired angle relatively to the' longitudinal extent of "the ship; andinthus swinging in and out, 1t will always move 1n A Fig. 5 isa top planview of the base plate i path of therdavit as it moves to Aits inboardposition. Therefore, inV orde-r to the plate 6 to rotate around thecenter 5X, l' provide the outer end portion 6a of said plate, on itsunder side, with*l a circular tongue 6b, and this projecting end 6a ofsaid guide plate I mount on the base plate 8 which is rigidly secured to`the deck Y of the ship, and has a circular groove 8 adapted `torotatably receive the to'nguelb tot rotate-therein, the common centerfrom which said tongue and groove are struck bc-Y ingat the point 5 whenthe parts are in Y their operative positionl relatively to each other. YA v The outer end 6a of they guide plate is fur'- ther `provided with acurved slot 9, also struck from the center 5X, and working in this slotis a bolt 10 for suitably holding and locking the end Gaof the guideplate in engagement with the base plate 8. Y

Y At the inner end of the guide plate 6 is a segmental locking plate 11rigidly secured to' the deck ofthe ship, and provided with a' slot 12also struckvfrointhe center 5X, and in this slot is received ,a lockingbolt 13 can ried by the'ii'ange 14A at the extreme inner end of the"guide late,lwhich flange projects Vunderneath the inner edge of thelocking late 1l. p

Y Hencejit will be seen that the guide plate 6 willv be very securelyheld in lany position'to which it is adjusted, being locked at its cuterendto the base plate 8,

and at its inner end to the locking plate 11.

The plate 11 'may be made to include as great an larc of a circle as theneeds of each case may require.

My davit has two distinct movements: first, its rotary movement whichdoes not 'change the'angular positionV of the lower portion of; thedavit, but causes its upper portion to swing around by gravity when thedavit is in its normal inclined position;`

and secondly, its Voutboard and inboard movement in which the entiredavit is rocked inwardly and outwardly on the ball and socket jointatthe lower yend thereof,thc'

davitbeing,r guided in thismoveinent by the slot 7 of the guide plate. I

j4 This rocking movement of the davit on its l lower end is preferablycontrolled by a screw mechanism having an internally threaded vpipe 15,and a cooperating externally threaded pipe or bar 16, thel pipe 15 beingbifurcated at its outer end to form the branches 15a for pivotalengagement with the davit, and the threaded bar 16 being sup- Y portedat its inner end by the post 17 at the inner end of the guide bar 6. VAshort bar or shaft 18 i`s rotatably mounted inthe post 17, and isv heldagainst endwi'se movement Vtherein by the two collars 19 rigidly securedto said shaft, one on either side of said post. The shaft 18 and thethreaded bar 16 are connected together by means of a universal joint 2o.n 1 c Y On theV outer end of the shaft 18 is a hand V wheel 21 forrotating the same to operate the screw mechanism of the davit. VThecooperating parts 15 and 16 of `this mechanism constitute a Vthrustscrew for imparting to the davit a very positive inward and out-l wardmovement when occasion requires.

At the outer bifurcated end of Vthe threaded pipe 15, I provide thedavitwith'a brake wheel 22 rigidly secured to the davit and receivedbetween the branches 15a at the end of ,thel pipe. For this wheelIprovide any suitable brake mechanism of ordinary or. preferredconstruction.V For the purposes of this application I .have deemed itsufficient to simply show a strongband brake 23 provided ondiametrically opposite sides ofthe brake wheel'with rigid bosses 24, andterminating in twoA end sections 2.5 approximately parallel with each.other, and

providedwith a clamping screwr26. The

bosses 24 have pivotal. connection with the branches 15a by means ofthepivots 27.

Whenthe davit is standing in an inclined position (for instance asillustrated iny full lines in Fig. l1,which is its normalposition), withits, upper portion turned `more or less away ,from the. direction inwhich the davit is leaning, thedavit willhave a tendency to swingvaround 'by gravity, and thev greater the weight. imposed. upon thedavit and the greater its inclination,the reater will be its tendencytoV thus rotate. ence, when the lifeboat chock, withfwhich this davit isintended'to coperatecollapses and suddenly throws the weight of the boaton the davit, the davit is `liable to rotate too suddenly, especially ifthe .ship chances torpitch or tilt in a direction to increase theoutward inclination of the davit` Incases of this kind, or when heavierloads than had vbeen anti-r cipated, lare suddenly thrown upon thedavit, the brake serves a most useful-.purpose in preventing theboat'from being automati-v cally pitchedrtoo suddenly overboard. It

will therefore be seenthat with my inclined davit the brake serves amost. useful purpose in checking' itsmomentum as it rotatesv outwardly.Italso yserves a further very useful purpose, in providing means Vforlocking the davit at any desired point of its' rotation. This isespecially desirable whenV the davit isin its extreme outboard and in-,board positions where itk is very desirable that it should not berotating back and forth ico as the ship rocks, orthe windshlow, or otherslight forces operate uponit, or upon ln ordertliat the hand hrake mayvlle amply strong tov support the weightimposed upon it at times, and mayyet be flexible' enough to. operate well as aV brake, l lmay make it/asbroad as may he necessary and make the brake vwheel 22 correspondinglylong. The brake wheel'is provided at its ends with annular outwardly,extending anges 22a to hold'tliehand brake against longitudinalmovementon the'brake wheel.

The strain imposed upon the hand brake by the resistance which it'offersto the rotation of the davit imposes a lateral strain upon the thrustscrew arrangement, and to prevent this strain from everdnicklingv orbending the threaded telescopmg parts and 16 in' a way that mightprevent them from working` properly, l ere lt upoirthe guide plate 6asecond post 28 provided with a slot '29 through which the threaded pipe15 passes. This post will resist any sudden or excessive lateral strainthat the brake may ever impose upon the thrust screw. n

`The larger section v15 of the thrust screw arrangement isv placedoutwardly next the davit because its greater diameter adapts it to oliergreater resistance to the lateral strain imposed upon the thrust screwarrangement by the brake, which strain is or course greatest at theouter end ot' the thrust screw adjacent the post 2S.

rhe guide har 6 is provided with the lateral extensions GX on oppositesides ot the post 28 to widen said bar at that point to prevent thelateral strain imposed upon the post 2S from imparting a twisting strainto -the guide har. The slot QQiis sufficiently long, to permit themember' l5 of the thrust screw to ino-.fe downwardly withoutinterference when the davit is rocked to its lowest out- Y hoardposition. i

rlhe section 1:3 of' the thrust screw may he provided on its outsidewith a. loose-litting section of pipe 30 (as. indicated in dotted linesin Fig. l) it desired, which pipe can he used as a cover for the exposedthreaded portion or the Screw bar 16, when the davit is standing idle.

lThe universal joint 2O will enable the thrust screw to operate thedavit equally well in all positions.

The tlluS. SCIGW and the guide Dplate .6 hlm' aus entend in the same.longitudinal di-) a when'one is adulsted l0 a (hilt/1th `vosition. theother is moved with 1t, S0 that than. relative longitudinal' rela-tionto each other is not changed but remains always the en l 7parits alwayslie1 extends centi-ally through the socket at the lower end o1 'e e;avvii. en that the lower portion or the (ravit,

rection;

the vertical plane, in which these p asy it rocks inwardly and outwardlyon its socket support 1.1-, always moves in this same To gum up lt willbe geen, igttlnt I have provided a davit 'which normally stands with itslower portion vin an inclined position, and has adjustingmeansforchanging its inclination to any desired angle.; secondly, thatthe. davit will vtend 'to automatically swing; around by gravity andcome to rest in a vertical plane entendinglongitudinally ot' the guideplate whenever the lower portion of the davit-is inclined toward one endor the other otsaid plate, andthat the greater the inclination of thedavitv,.a s a whole, the stronger will this tendency he; thirdly, thatsince the guide plate is rotatable around the point 5*, itlmay be causedto extend longitudinallyv toward A any desired point ot the compass, andtherchythe point towardwhich the davit shall tend to move and come torest can Vhe accurately predetermined, so that the davit may he adjustedto swing overboard and come to rest at any desired angle tothelongitudinal extent of the ship; iourth, that the movement of the davitin any desired direction is not lett dependent upon the tendencyimparted to the davit by the adjusting,- means to move it in thatdirection, but that it is further provided 95 with means for positivelyguiding it and forcing it to move in the predetermined direction; and,liith, that it is provided with brake mechanism for checking` itsmovement, or locking it at any desired point in its ro- 100 tation.

s to the operation or" my davit, itV is only necessary to add thatwhen'a lifeboatY is to he placed on the checks, the davit is drawninhoard hy means -ol' the thrust screw ar- 105 i-angenient, till .itslower portion has passed the vertical and reached its innermostposition, inclining' slighty inhoard, as indicated in dotted lines inFig. 1. lt will then have a slight inclination to automatically rotate110 inwardly, and hence when the brake is released, the boat can he mosteasily drawn inhoard into position to he lowered onto the checks. Whenthe heat is secured on theV checks. the davit rotated vtill Vits upper115 end is brought into its normal angular relation to theloneitudidnal,extent of the ship, and then the brake is applied again.The davit is then bodily rocked outwardlf,7 h v means of the thrustscrew into its normal 013-' 120 Olatit'e position. as illustrated infull lines' in Fig'. l, and the tackle connecting it vvth' the liieoort'is properly adwdusted. 1t will now he seeirthat when the llOC COBQSPS,V and the weight ot' the boat is thrown upon 170 the davit, the .davitwill automatllly seing ai@ boat overboard, m rOSltlOn L0 be lowered'into the Wle- Then the weather is rOUgh and there. 1S

dangel. of bumping the lifeboat agalns the .130

a guide for the davit to hold it against rocking bodily in a plane "at4right angles to the longitudinal extent of' the thrust mechanism Yandyto relieve the thrust mechanism from' lateral strain `when in itsextended outboard position.

l5. In a device of the character described, aY davit mounted foruniversal rocking movement; a rotatable guide provided with a guideway,said j guide having its center of rotation insaid guideway at a point invertical alinement with the center upon which the davit rocks; actuatingmechanismL for rocking the davit Vbodily packV and forth in saidVguideway; and'means for jadjusting the guideV with its guideway to`extend toward different points yof the compass, to adapt thel davit torock in any desired direction. i f l Y 16.*In a' device of thecharactervdescribed, av davit mounted lfor, universal rocking movement;a rotatable guide provided withV a` guideway, said guide having itscenter of rotation in said guideway at a point Vin .vertical alinementwitlithexcenter upon which the vdavit rocks; actuating mechanism forrocking the davit bodily back and forth in said guideway, said actuatingmechanismv extending in the samedirection asV said guideway and beingadapted to rotate with said guide; andjmeansfor adjusting saidY parts toextend in diil'erent directions, whereby to impart tothe davit positiveguided j movement' in any desired direction relativelyv to thelongitudinal extent of the ship,'

17. Ina device of the character described,

'a davit mounted for universal movement on the second kdeck of a shipand extending upwardly. above the upper deck, -the upper and lowerportionsV of the davit being disposed at` anangle to each other; meanson the upper deck for normally holding the,

lower portion of the davit to rotate on'its longitudinal axis, normallyin an inclined position, and for otherwise controlling and operating thedavit, said means comprising ar rotatable guide plate having a. portionextending outwardly beyond the upper deck provided with a guideway, saidguide having its center of rotation in said guide- Wayy at a'point linvertical alinement with the center upon which the davitrocks; a p'ostlatthe inner end of said' guide plate; thrust screw mechanism journaled insaid post at its inner end and engaging the davit at its outer end lwitha universal joint near its inner end adjacent said post;` a frictionlock kfor engaging the davit at theoutei' end of thejthrust mechanism; asecond post mounted on the guide plate near the outer endoi1 the thrustmechanism and provided with aslot through whichthe thrust mechanismpasses, whereby to brace vsaid mechanism against the lateral strainimposed thereupon by 'the lock; and 'a segmentalk plate at'the'inner endof the guide plate provided with means for rigidlysecuring the guide'`plate at any .desired angle of adjustment, whereby to adapt the davit torock in any desired direction.

p 18,"In a device ofthe characted described,

a davit having its upper and lower portions disposed atan angle to eachotherand normally held 1n an inclined position to cause they davit torotate by gravity gfmeans forl adjusting thedavit to .differentangles'of inclination; a non-rotatable memberadapted for irictional'engagement with the davitl in all its positions, to 'form a brake forregulating the degree of frictional engagementbetween said parts. Y ,j i

In testimony whereof I aiiiX my signature.

A. PSCHAT.

AUTOMATIC DAVIT. K APPLICATION FILED Jvu'NE 21'. 1920.

